2.1.221

Update pygments.rb requirement from 2.3.0 to 2.3.1 (#307)

Updates the requirements on [pygments.rb](https://github.com/pygments/pygments.rb) to permit the latest version.
- [Release notes](https://github.com/pygments/pygments.rb/releases)
- [Changelog](https://github.com/pygments/pygments.rb/blob/master/CHANGELOG.adoc)
- [Commits](https://github.com/pygments/pygments.rb/compare/v2.3.0...v2.3.1)

---
updated-dependencies:
- dependency-name: pygments.rb
  dependency-type: direct:production
...

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